/**
  * setup object.
  */
 protected function _setupObject()
 {
     $id = $this->_getId();
     $this->mObjectHandler =& $this->_getHandler();
     $this->mObject =& $this->mObjectHandler->get($id);
     if ($this->mObject == null && $this->_isEnableCreate()) {
         $this->mObject =& $this->mObjectHandler->create();
     }
 }